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Radionuclide Dosimetric Data Sheets
Cobalt-60m
Summary data
General
Classification
Isotope: Co-60m
Atomic number (Z): 27
Mass number (A): 60
Neutron number (N): 33
Radioactive decay
Decay modes: β-, Internal transition
Half-life: 10.47 [m]
Decay constant: 1.1037e-03 [1/s]
Daughters: Co-60 (99.8%), Ni-60 (0.24%)
Radioactive daughters: Co-60
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.05647 [MeV]
Mean photon energy: 0.00668 [MeV]
Air kerma rate constant, Γ10: 1.583e-19 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.583e-19 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.048e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 0.000e+00
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
9.048e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.070e-15
[Gy·kg/Bq·s]
Dose point kernels (plot)
Dose point kernel source: Graves, et al. Medical Physics. 2019 Nov.; 46(11):5284-5293.
Note: Bins are spaced every 0.1 mm until a radius of 10 cm, and every 1 mm until a radius of 2 m.
Download tabulated dose point kernel file here: www.mirdsoft.org/products/MIRDspecs/Co-60m DPK.csv
Summary spectra (plot)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Download tabulated summary spectra file here: www.mirdsoft.org/products/MIRDspecs/Co-60m Summary Spectrum.csv
Beta spectra (plot)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Download tabulated beta spectra file here: www.mirdsoft.org/products/MIRDspecs/Co-60m Beta Spectrum.csv
Tabulated data
Summary spectra (table)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Note: Radiations with yield < 0.01 are excluded from the table, but are available in the linked *.csv data.
Download tabulated summary spectra file here: www.mirdsoft.org/products/MIRDspecs/Co-60m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.35401e-05 |
5.224e+00 |
X-ray |
|
6.87316e-03 |
9.221e-02 |
X-ray |
|
6.88840e-03 |
1.803e-01 |
X-ray |
|
7.60650e-03 |
1.119e-02 |
X-ray |
|
7.60846e-03 |
2.198e-02 |
X-ray |
|
5.86030e-02 |
2.058e-02 |
Gamma |
|
4.39205e-05 |
2.129e+00 |
Auger electron |
|
7.49251e-05 |
2.524e-01 |
Auger electron |
|
6.98200e-04 |
1.327e+00 |
Auger electron |
|
7.44749e-04 |
1.548e-02 |
Auger electron |
|
6.03079e-03 |
4.143e-01 |
Auger electron |
|
6.77509e-03 |
1.025e-01 |
Auger electron |
|
5.09223e-02 |
8.291e-01 |
Conversion electron |
|
5.76801e-02 |
1.009e-01 |
Conversion electron |
|
5.77955e-02 |
1.420e-02 |
Conversion electron |
|
5.78107e-02 |
3.276e-02 |
Conversion electron |
Useful Links
Isotope decay characteristics are periodically updated as better measurements can be made - changes that may not be reflected on this page. Please see useful links:
National Nuclear Data Center (NNDC): https://www.nndc.bnl.gov/nudat3/mird/
International Atomic Energy Agency (IAEA) Livechart: https://www-nds.iaea.org/relnsd/vcharthtml/VChartHTML.html
Reference Links
ICRP Report 107: https://www.icrp.org/publication.asp?id=ICRP%20Publication%20107
Graves et al. Dose Point Kernels: https://doi.org/10.1002/mp.13789
MIRD Decay Schemes 2nd Edition: https://sites.snmmi.org/SNMMI-MAIN/iCore/Store/StoreLayouts/Item_Detail.aspx?iProductCode=0-932004-80-6
MIRDsoft MIRDspecs version 20250101 (www.mirdsoft.org)
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